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Safety instructions   

A.

 

Important safety instructions!   

Thank you for choose KINGREX PREference pre-amplifier. We sincerely hope you could keep 
the user manual for whole PREference life, it provides you with better protection for 
connected equipment.   
 
Please read this user manual very carefully. It provides safety, installation, and operating 
instructions that will help you derive the overall performance and fully extend the life that 
the PREference has to offer.     
 
Please save this manual! It includes important instructions for the safely use PREference 
and for obtaining factory service should the proper operation of the PREference come into 
question. 
 
Please save or recycle the packaging materials! The PREference’s shipping materials were 
designing with great care to provide protection from transportation related damage. These 
materials are invaluable if you ever have to return the PREference for service. Damage 
sustained during transit is not covered under the warranty. 

 

B.

 

 Safety caution! 

z

 

To reduce the risk of electric shock, disconnect the PREference reserved power supply unit 

from the mains supply before installing the PREference pre-amplifier. Reconnect the 
power cord only after signaling interconnections have been made. 

 

z

 

The following precaution should be observed when working on the power supply unit: 
-Remove watches, rings or other metal objects. 
-Use tools with insulated handles. 
!!! Caution: Risk of electric shock, do not remove cover. No user serviceable parts inside, 
Refer servicing to qualified service personnel. 
!!! Warning: To reduce the risk of fire, replace only with the same type and rating of fuse. 
!!! Warning: To reduce the risk of fire or electric shock, install in temperature and humidity 
controlled indoor area of conductive contaminants. 
 
-To prevent fire or shock hazard, do not expose this appliance to rain or moisture. 
-Do not dispose of in fire to prevent injury or burns. Also do not place the units near the 
heat sources such as radiator, heat registers, stoves, or other devices (including amplifiers) 
that produce heat.   
-Do not disassemble the machine with power on. If you do, you may receive an electric 
shock.  
-Do not let children (or grownups) push anything into holes or slots in the case-this could 
result in harmful electrical shock and could cause damage of the equipment.   

Содержание PREference

Страница 1: ......

Страница 2: ...Specification C Main feature PREference Pre amplifier phono stage specifications Connecting to the main A PREference pre amplifier B PREference Power supply unit C Optional PREference phono stage board Connecting other equipment D Input E Output Placement notice a Bad setting b Good setting How to operate F Selecting source G Adjusting the volume H PREference pre amplifier setting Maintenance Serv...

Страница 3: ...Contents of KingRex PREference pre amplifier package PREference pre amplifier 1 pc PREference power supply unit 1pc PREference DC power cord 1 pc User manual 1 pc Warranty Card 1pc ...

Страница 4: ...he PREference reserved power supply unit from the mains supply before installing the PREference pre amplifier Reconnect the power cord only after signaling interconnections have been made z The following precaution should be observed when working on the power supply unit Remove watches rings or other metal objects Use tools with insulated handles Caution Risk of electric shock do not remove cover ...

Страница 5: ...following You must connect the green and yellow wire to the pin marked by the letter E or by the safety Earth symbol or colored green and yellow or green You must connect the blue wire to the pin which is marked with the letter N or colored black You must connect the brown wire to the pin which is marked with the letter L or colored red You must have a fuse in the plug adaptor or at the distributi...

Страница 6: ...ge better than 126dB the PREference will be the chosen one for discerning audiophiles B Specification PREference preamplifier Inputs RCA 4 Output RCA 1 Gain 7dB 14dB 20dB Selectable 20Hz 20Khz 0 0 1dB Frequency Response Range 5Hz 80Khz 0 1 0dB Maxium Input Level 9Vrms 0dB Maxium Output Level 9Vrms THD Noise 0 0005 1KHz 1 1V For 2 5V Out 7dB Gain 510mV For 2 5V Out 14dB Gain Input Sensitivity 250mV...

Страница 7: ... Rotary Encoder switch to select four inputs another is ALPS RK27 volume pot to provide the fully enjoyment of Hi Fi sound PREference Pre amplifier GAIN Setting PREference power supply unit 1 Reserved power supply unit isolated power system design It provides pure signal sources less noise and distortion than switching power adaptor or build in power system 2 Using NEUTRIK gold plating XLR socket ...

Страница 8: ......

Страница 9: ... stage Board installed the vinyl signal will pass through IV input Please do not connect with any other line level output device or it will have the funny sound into your loudspeakers 2 Please note that all connectors of the PREference are gold plated This is done to ensure long lasting and stable connections Do only use cable and connectors either gold or silver plated Output One pair unbalanced ...

Страница 10: ...tion please do some testing as following procedure 1 Please power on the PREference PSU choose the input selector into IV phono stage input Please noted the volume should be set to the minimum and disconnect the input IV cable from preference side to make sure no any external noise into the preference 2 Adjust the volume of PREference to suit your audition habit 3 Please check the sound if there i...

Страница 11: ...ase pass reading this section of the PREference If you have chosen the phono stage for your PREference please read about the instruction included the safety instruction and safety notice 1 When you received the PREference you might notice there are one frame and one engraved PREference sliding aluminum panel The sliding panel could be pull out there are two DIP switch of R L channel on the phono s...

Страница 12: ...est them both and choose the one you prefer the most We would like to suggest you to test the gain setting from Low Gain to High Gain Normally the performance of the low gain might be better as the noise might be lower ...

Страница 13: ...ng of the devices should follow the manufacturer s instructions and should use a mounting accessory recommended by the manufacturer Please read all the safety and operating instructions before connecting or using this unit Retain this notice and the user manual for future reference Service The simplicity of the KingRex PREference pre amplifier and reserved PSU are very few parts can be breaking do...

Страница 14: ...as lightening fluctuations in electrical power improper maintenance or use in violation of instructions provided in this user manual or to products which have been altered or modified This warranty doex not extend to products which have had the serial number removed altered or rendered illegible 6 Physically damaged products are not covered by this warranty and will be returned as received without...

Страница 15: ...urchasing After the warranty we still offer repairing service change for service components PURCHASING COMPANY PURCHASE DATE Client Information The warranty is annulment by following condition The damage of machine by artificial damage improper using repair or refit by yourself nature disaster lightening strike leaking water using power voltage didn t follow designated unable provide warranty cert...

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